Five people were killed when a vehicle plunged about 100 feet off a cliff along Northern California's scenic Pacific Coast Highway near Mendocino.

The California Highway Patrol identified the victims Tuesday as two women from West Linn, Oregon and three children. Their names and ages were not immediately released.

In a report on the crash, the CHP said a 2003 GMC was driving south along Highway 1 on Monday when it pulled into a dirt turnout along the road and for unknown reasons continued directly off the cliff.

The CHP said the vehicle landed on its roof on a large rock, killing all five.

Investigators said it was not clear what caused the crash. The weather was reported as clear and drugs and alcohol were not considered factors.